package com.nowcoder.community.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.community.annotation.LoginRequired;
import com.nowcoder.community.community.entity.User;
import com.nowcoder.community.community.service.UserService;
import com.nowcoder.community.community.util.*;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private MailClient mailClient;

    @Autowired
    private HostHolder hostHolder;

    @Autowired
    private RedisTemplate redisTemplate;

    //获取注册页面
    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }
    //获取登录页面
    @RequestMapping(path = "/login",method = RequestMethod.GET)
    public String getLoginPage(){
        return "/site/login";
    }

    @RequestMapping(path = "/forget",method = RequestMethod.GET)
    public String getForgetPage(){
        return "/site/forget";
    }

    /**
     * 注册用户
     * @param model
     * @param user
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()) {
            // 注册成功，跳转第三方页面后再跳转回首页
            model.addAttribute("msg", "注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活！");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            // 注册失败，返回注册页面，并带回错误信息
            model.addAttribute("usernameMsg",map.get("usernameMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            model.addAttribute("emailMsg",map.get("emailMsg"));
            return "/site/register";
        }
    }

    /**
     * 激活邮箱
     * @param model
     * @param userId
     * @param code
     * @return
     */
    // http://localhost:8080/community/activation/101/code
    @RequestMapping(path = "/activation/{userId}/{code}",method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId,@PathVariable("code") String code){
        int result = userService.activation(userId,code);
        if(result == ACTIVATION_SUCCESS){
            //激活成功
            model.addAttribute("msg","激活成功，您的账号已经可以正常使用了！");
            model.addAttribute("target","/login");
        } else if (result == ACTIVATION_REPEAT){
            //重复激活
            model.addAttribute("msg","无效操作，该账号已经激活过了！");
            model.addAttribute("target","/index");
        } else {
            //激活失败
            model.addAttribute("msg","激活失败，您提供的激活码不正确");
            model.addAttribute("target","/index");
        }
        return "/site/operate-result";
    }

    /**
     * 生成验证码
     * @param response
     */
    @RequestMapping(path = "/kaptcha",method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response/*, HttpSession session*/){
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入session
        // session.setAttribute("kaptcha",text);

        // 验证码的归属
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);// 验证码失效时间1分钟
        cookie.setPath(contextPath);
        response.addCookie(cookie);
        // 将验证码存入Redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);

        // 将图片输出给浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image,"png",os);
        } catch (IOException e) {
            logger.error("响应验证码失败" + e.getMessage());
        }

    }

    /**
     * 用户登录
     * @param model
     * @param username Spring MVC会把像User这样自定义的实体自动注入model中，在html页面便可以直接使用；
     * @param password 而对于String、int等普通的数据类型，Spring MVC不会将其注入model，若要在页面使用，则有两种方法：
     * @param code      一、手动添加进model   二、在request域中取值，在html页面中：eg：${param.username}
     * @param rememberme 是否记住密码
     * //@param session 从session中获取保存的验证码，判断与输入的是否相同
     * @param response 将ticket存入客户端的cookie中
     * @return
     */
    @RequestMapping(path = "/login",method = RequestMethod.POST)
    public String login(Model model,String username,String password,String code,
                        boolean rememberme/*,HttpSession session*/,HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner){
        // 检查验证码
        // String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        if(StringUtils.isNoneBlank(kaptchaOwner)){
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }

        if(StringUtils.isBlank(code) || StringUtils.isBlank(kaptcha) || !kaptcha.equalsIgnoreCase(code)){
            model.addAttribute("codeMsg","验证码不正确！");
            return "/site/login";
        }

        // 检查账号、密码
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if(map.containsKey("ticket")){
            // 登录成功
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        } else {
            // 登录失败
            model.addAttribute("usernameMsg",map.get("usernameMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            return "/site/login";
        }

    }

    /**
     * 退出登录
     * @param ticket
     * @return
     */
    @RequestMapping(path = "/logout",method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket){
        userService.logout(ticket);
        // 退出时清理用户的认证信息
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }

    /**
     * 发送邮箱验证码（忘记密码）
     * @param model
     * @param email
     * @param response
     * @return
     */
    @RequestMapping(path = "/emailKaptcha",method = RequestMethod.GET)
    public String emailKaptcha(Model model,
                             @RequestParam(name = "email",required = false,defaultValue = "") String email,
                             HttpServletResponse response,HttpSession session){
        // 获取验证码
        String text = kaptchaProducer.createText();
        Map<String, Object> map = userService.sendEmailKaptcha(email,text);
        if(map != null && !map.isEmpty()){
            // 发送失败
            model.addAttribute("emailMsg",map.get("emailMsg"));
            model.addAttribute("codeMsg",map.get("codeMsg"));
            return "/site/forget";
        }
        // 将验证码存入session
        session.setMaxInactiveInterval(10 * 60);
        session.setAttribute("emailKaptcha",text);

        return "/site/forget";
    }

    /**
     * 找回密码（忘记密码）
     * @param model
     * @param session
     * @param email
     * @param code
     * @param password
     * @return
     */
    @RequestMapping(path = "/updatePassword",method = RequestMethod.POST)
    public String updatePassword(Model model,HttpSession session,
            String email,String code,String password){
        // 检验验证码
        String emailKaptcha = (String) session.getAttribute("emailKaptcha");
        if(StringUtils.isBlank(code) || StringUtils.isBlank(emailKaptcha) || !emailKaptcha.equalsIgnoreCase(code)){
            model.addAttribute("codeMsg","您的验证码不正确！");
            return "/site/forget";
        }
        Map<String, Object> map = userService.updatePassword(email, password);
        if(map != null && !map.isEmpty()){
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            return "/site/forget";
        }
        model.addAttribute("msg","您已成功修改密码，可以正常使用了！");
        model.addAttribute("target","/login");
        return "site/operate-result";
    }

    /**
     * 修改用户密码（账号设置）
     * @param model
     * @param oldPassword
     * @param newPassword
     * @param newPasswordChecked
     * @return
     */
    @LoginRequired
    @RequestMapping(path = "/updatePasswordByOld",method = RequestMethod.POST)
    public String updatePasswordByOld(Model model,String oldPassword,String newPassword,String newPasswordChecked){
        // 获取当前登录用户
        User user = hostHolder.getUser();

        // 检验新密码是否一致
        if(!newPassword.equals(newPasswordChecked)){
            model.addAttribute("newPasswordMsg","两次输入的密码不一致！");
            return "/site/setting";
        }

        Map<String, Object> map = userService.updatePasswordByOld(user, oldPassword, newPassword);
        if(map != null && !map.isEmpty()){
            // 修改失败
            model.addAttribute("userMsg",map.get("userMsg"));
            model.addAttribute("oldPasswordMsg",map.get("oldPasswordMsg"));
            model.addAttribute("newPasswordMsg",map.get("newPasswordMsg"));
            return "/site/setting";
        }
        model.addAttribute("msg","您已成功修改密码，需要重新登录！");
        return "redirect:/logout";
    }

}
